In Japanese mythology, Momotaro is a boy born from a peach and raised by an elderly couple. When he grew up, he set off for the island of demons to exterminate the demons that often bothered the local villages. En route, he made companions of a monkey, a dog and a pheasant to support him against the demons. Beating away the demons, he returned to his village with lots of treasures taken from the island.
Oshima Joun was born in Edo and learned lost-wax casting under his father. In 1881, he exhibited his collaborative work with Takamura Koun (1852-1934) at Dainikai Naikoku Kangyo Hakurankai (The second National Industrial Exposition). He gained a post at the Tokyo Art School of Fine Arts in 1892.